stopgap for onion v2 to v3 migration

I use Tor onion services (location-hidden services) to manage a lot of my servers, since some are behind NAT or have dynamic IP addresses and onion services do excellent NAT traversal and allow access without knowing IP addresses. Alas, for security reasons the older v2-style onion addresses will deprecate in 11 days. I thought it would be trivial to generate v3 addresses for all my servers, and for most it was, but I ran into some grief.

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